Atomically Visualizing Elemental Segregation-Induced Surface Alloying and Restructuring.

作者信息

Zou Lianfeng, Li Jonathan, Zakharov Dmitri, Saidi Wissam A, Stach Eric A, Zhou Guangwen

机构信息

Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York at Binghamton , Binghamton, New York 13902, United States.

Department of Physics, Applied Physics and Astronomy & Materials Science and Engineering Program, State University of New York , Binghamton, New York 13902, United States.

出版信息

J Phys Chem Lett. 2017 Dec 21;8(24):6035-6040. doi: 10.1021/acs.jpclett.7b02947. Epub 2017 Dec 4.

DOI:10.1021/acs.jpclett.7b02947

PMID:29193974

Abstract

Using in situ transmission electron microscopy that spatially and temporally resolves the evolution of the atomic structure in the surface and subsurface regions, we find that the surface segregation of Au atoms in a Cu(Au) solid solution results in the nucleation and growth of a (2 × 1) missing-row reconstructed, half-unit-cell thick L1 CuAu(110) surface alloy. Our in situ electron microscopy observations and atomistic simulations demonstrate that the (2 × 1) reconstruction of the CuAu(110) surface alloy remains as a stable surface structure as a result of the favored Cu-Au diatom configuration.

摘要